学习CSS flexbox的一个游戏：flexboxfroggy

flexboxfroggy是学习CSS flexbox的一个游戏。

Welcome to Flexbox Froggy, a game where you help Froggy and friends by writing CSS code! Guide this frog to the lilypad on the right by using the justify-content property, which aligns items horizontally and accepts the following values:

• flex-start: Items align to the left side of the container.
• flex-end: Items align to the right side of the container.
• center: Items align at the center of the container.
• space-between: Items display with equal spacing between them.
• space-around: Items display with equal spacing around them.

For example, justify-content: flex-end; will move the frog to the right.

在线地址：http://flexboxfroggy.com/